Make object in glass material not look like its underwater?
If you're using a Glass Shader, try bringing the IOR closer to 1, but not all the way to 1 because that will cause you to loose the dome reflections.
Default IOR - 1.45 - Cube is bent

IOR at 1.0 - too low - Cube is normal but glass shape (reflections and refraction) is completely lost.

IOR at 1.10 - More realistic - Glass is still visible without bending the cube noticeably. However, notice the background is refracted differently as well - you will have to find an appropriate balance that works for your project.